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I have been successfully running 10.12.2 public beta with my AMD Fury X. I add 0x73001002 to AMDRadeonX4100.kext and AMD9000Controller.kext.

The latest public beta 3 changed the AMDRadeonX4100.kext and broke my system. My system boots and I get all the way to a full progress bar. The system dims like it does before loading and then goes back to display the progress bar. I reinstalled the 4100.kext from beta 2 and the Fury X works again.

It appears that my only solution right now is to boot with onboard graphics connected. If I switch to the Fury X after booting, it works. If I boot with the Fury X connected, the screen still stops with the progress bar at 100%

Thanks for reporting back your progress. Would you mind detailing how exactly you would get a fury x working properly from the beginning? How stable is it now? Can you boot with it in or do you still have to switch over?

So far the card actually works right now as I'm typing but it has artifacts everywhere and will not play videos smoothly let alone play video games at all. I would like some help to see if I could get the card to run smoothly and if you could explain in more depth so I can see where I am going wrong.

All I did was take out my AMD hd 7870 card and put in the Pro Duo and it got me this far. Please help.

Download Xcode from the App Store and download Kext Utility from this website.

The Kexts are located in System/Library/Extensions. Right click on the kext and select Show Package Contents. Open the contents folder and drag the info.plist file to the desktop. I use Xcode to edit the file, there are other editors available that work also. Open info.plist with Xcode and add 0x73001002 as shown above. Save and drag the info.plist file back into the contents folder. You will be asked to authenticate, do so and select replace. Do this for the AMDRadeonX4100.kext and the AMD9000Controller.kext

Run Kext Utility in order to rebuild the kext cache.

Reboot with the Fury X connected. You should get acceleration now and eliminate the artifacts.

Download Xcode from the App Store and download Kext Utility from this website.

The Kexts are located in System/Library/Extensions. Right click on the kext and select Show Package Contents. Open the contents folder and drag the info.plist file to the desktop. I use Xcode to edit the file, there are other editors available that work also. Open info.plist with Xcode and add 0x73001002 as shown above. Save and drag the info.plist file back into the contents folder. You will be asked to authenticate, do so and select replace. Do this for the AMDRadeonX4100.kext and the AMD9000Controller.kext

Run Kext Utility in order to rebuild the kext cache.

Reboot with the Fury X connected. You should get acceleration now and eliminate the artifacts.

I tried that (only after unlocking hidden files thanks to my brother) but I when i tried to use the kext utility to rebuild the cache, it didn't work and my computer will not boot now. I'm trying recover the mac but what should I try next?